Malicious PDF — malware analysis report

Static analysis result for SHA-256 928cb38a79583211…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 00:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a2301d03af646182601b7d3121884ab SHA-1: 529daba278f978f83bc45d6fa007de056572b957 SHA-256: 928cb38a79583211c5b11fe736d221a339664de88747e9890027dabcf1a9251a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=gta+san+andreas+v+2.00 PDF link annotation
    • https://maychieuvinh.vn/upload/files/jodinojavexaxa.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/bubupudisudofaki.pdfIn PDF document text
    • https://tsegypt.com/file/jaziferatolonaxuribijesa.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/38176941056.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • http://thevalleytrader.com/files/75525689941.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/55809132276.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pajatesupelagagazovigime.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/bomonapuzofavowotara.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/puzabarunaxen.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/6114238726.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/13709011911.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vuvatozilij.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/13425800056.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefbb71b1---xosozariv.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/zikatubogukavikofexobukim.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/xufoxisebedo.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/2944414610.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xudaluselopuravewidu.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lapovigotivobipeji.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/71643422964.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908200126.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/86025791925.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56312e459---gajilufesamarixeposuka.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/mujigik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 17388 bytes
SHA-256: c54c2f20fb2b9195906ed99e96f8d1f689f2a283b58adaa331fdc3eeb75491e4
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10396 bytes
SHA-256: 03ff5b26144067f309f751a2345b9259b86c672a6aee47f2081856256750de14